-
Notifications
You must be signed in to change notification settings - Fork 3
/
utils.cpp
72 lines (57 loc) · 1.56 KB
/
utils.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
//
// utils.cpp
//
// Efficient Cryptanalysis of Homophonic Substitution Ciphers
// CS 298, Department of Computer Science, San José State University
// Copyright © 2011 Amrapali Dhavare. All rights reserved.
//
// Modified 2016 by Markus Amalthea Magnuson <markus@polyscopic.works>
//
#include "utils.h"
#include <cstdlib>
#include <fstream>
#include <iostream>
#include <cstring>
int get_distinct_symbols(char *buffer, int distinct[256]) {
int i;
int count = 0;
size_t buff_size = strlen(buffer);
for (i = 0; i < 256; i++) {
distinct[i] = 0;
}
for (i = 0; i < buff_size; i++) {
int index = buffer[i];
distinct[index]++;
}
for (i = 0; i < 256; i++) {
if (distinct[i]) {
count++;
}
}
return count;
}
char * get_file_to_buffer(char *filename) {
char *buffer;
std::streamoff begin, end, file_size;
std::fstream file_stream;
file_stream.open(filename, std::fstream::in | std::fstream::out);
if (!file_stream) {
std::cout << "Can not open the file:" << filename << "\n";
return NULL;
}
begin = file_stream.tellg();
file_stream.seekg(0, std::ios::end);
end = file_stream.tellg();
file_size = end - begin;
file_stream.seekg(0, std::ios::beg);
buffer = new char[file_size];
if (!buffer) {
std::cout << "buffer new for cipher text file failed";
file_stream.close();
return NULL;
}
file_stream.read(buffer, file_size);
buffer[file_size - 1] = '\0';
file_stream.close();
return buffer;
}